<template>
<view :style="{width: systemInfo.width + 'px', height: systemInfo.height + 'px', backgroundColor: bgcolor, position: 'absolute', left: 0, top: 0, zIndex: 9998, overflow: 'hidden'}">
    <view v-for="(item,rect_idx) in skeletonRectLists" :key="rect_idx + 'rect'" :class="[loading == 'chiaroscuro' ? 'chiaroscuro' : '']" :style="{width: item.width + 'px', height: item.height + 'px', backgroundColor: 'rgb(194, 207, 214)', position: 'absolute', left: item.left + 'px', top: item.top + 'px'}"></view>
    <view v-for="(item,circle_idx) in skeletonCircleLists" :key="circle_idx + 'circle'" :class="loading == 'chiaroscuro' ? 'chiaroscuro' : ''" :style="{width: item.width + 'px', height: item.height + 'px', backgroundColor: 'rgb(194, 207, 214)', borderRadius: item.width + 'px', position: 'absolute', left: item.left + 'px', top: item.top + 'px'}"></view>

    <view class="spinbox" v-if="loading == 'spin'">
        <view class="spin"></view>
    </view>
</view>
</template>

<script>
	export default {
		name: "skeleton",
		props: {
			bgcolor: {
				type: String,
				value: '#FFF'
			},
			selector: {
				type: String,
				value: 'skeleton'
			},
			loading: {
				type: String,
				value: 'spin'
			},
			show: {
				type: Boolean,
				value: false
			}
		},
		data() {
			return {
				loadingAni: ['spin', 'chiaroscuro'],
				systemInfo: {},
				skeletonRectLists: [],
				skeletonCircleLists: []
			}
		},
		watch: {
			show() {
				this.attachedAction();
				this.readyAction();
			}
		},
		methods: {
			attachedAction: function(){
				//默认的首屏宽高，防止内容闪现
				const systemInfo = uni.getSystemInfoSync();
				this.systemInfo = {
					width: systemInfo.windowWidth,
					height: systemInfo.windowHeight
				};
				this.loading = this.loadingAni.includes(this.loading) ? this.loading : 'spin';
			},
			readyAction: function(){
				const that = this;
				//绘制背景
				uni.createSelectorQuery().selectAll(`.${this.selector}`).boundingClientRect().exec(function(res){
					that.systemInfo.height = res[0][0].height + res[0][0].top;
				});
				
				//绘制矩形
				this.rectHandle();

				//绘制圆形
				this.radiusHandle();
			},
			rectHandle: function(){
				const that = this;

				//绘制不带样式的节点
				uni.createSelectorQuery().selectAll(`.${this.selector}-rect`).boundingClientRect().exec(function(res){
					that.skeletonRectLists = res[0];
				});

			},
			radiusHandle(){
				const that = this;

				uni.createSelectorQuery().selectAll(`.${this.selector}-radius`).boundingClientRect().exec(function(res){
					that.skeletonCircleLists = res[0];
				});
			}
		}
	}
</script>

<style>
.spinbox{
  position: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  width: 100%;
  z-index: 9999
}
.spin {
  display: inline-block;
  width: 64rpx;
  height: 64rpx;
}
.spin:after {
  content: " ";
  display: block;
  width: 46rpx;
  height: 46rpx;
  margin: 1rpx;
  border-radius: 50%;
  border: 5rpx solid #409eff;
  border-color: #409eff transparent #409eff transparent;
  animation: spin 1.2s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.chiaroscuro{
  width: 100%;
  height: 100%;
  background: rgb(194, 207, 214);
  animation-duration: 2s;
  animation-name: blink;
  animation-iteration-count: infinite;
}

@keyframes blink {
  0% {
    opacity: .4;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: .4;
  }
}

@keyframes flush {
  0% {
    left: -100%;
  }
  50% {
    left: 0;
  }
  100% {
    left: 100%;
  }
}
.shine {
  animation: flush 2s linear infinite;
  position: absolute;
  top: 0;
  bottom: 0;
  width: 100%;
  background: linear-gradient(to left,
  rgba(255, 255, 255, 0) 0%,
  rgba(255, 255, 255, .85) 50%,
  rgba(255, 255, 255, 0) 100%
  )
}
</style>
